2. Enable USB Debugging Mode on the phone. Go to Settings >> About Phone. Tap on Build Number several times till the message shows "You are now a Developer". Then enable USB debugging by navigating to Settings >> Developer Options.

3. Make a backup of all your important data before following the guide.

4. Ensure the battery of the phone is charged more than 80 percent.

5. The Root Exploit package works only on the LTE version of the Galaxy S4 (GT-I9505). Applying this to any incorrect variant might brick the device. Verify the model number of the Galaxy S4 by navigating to Settings >> About Phone.

That's it! Samsung Galaxy S4 (LTE) I9505 running on Android 4.3 Jelly Bean is now rooted successfully. You can now install any app that requires root permission. Verify the root status of the device by downloading Root Checker app from Google Play Store.

Note: This exploit will NOT set the KNOX warranty void flag. It will set the "Custom" flag, but that's nothing to worry about.

Thank's to all fellas at XDA who first tried out this rooting technique. This method was originally posted via XDA-Developers original thread.